COMPUTER HARDWARE COMPONENTS FUNCTIONS
EXTERNAL AND INTERNAL STORAGE DEVICES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Has moving header to read the data
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is read by bouncing the laser beam off the surface off the medium.
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data is read directly from Microchip
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Uses light and pin to read the data
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Detailed explanation-1: -The data on the storage medium is read by bouncing the laser beam off the surface of the medium. If the beam hits a dot it is reflected back differently to how it would be if there were no dot. This difference can be detected, so the data can be read.
Detailed explanation-2: -The CD drive shines a laser at the surface of the CD and can detect the reflective areas and the bumps by the amount of laser light they reflect. The drive converts the reflections into 1s and 0s to read digital data from the disc.
Detailed explanation-3: -The inner face of CDs is scored with pits several micrometers long, which are arranged in a continuous spiral, and represent recorded data. Laser light is focused on these pits, and data is read by picking up the reflected light. DVDs work according on essentially the same principle.
Detailed explanation-4: -CD data is stored as a series of tiny indentations (pits), encoded in a tightly packed spiral track of pits moulded into the top of the polycarbonate layer. The areas between pits are known as ‘lands’. Each pit is approximately 100 nm deep by 500 nm wide, and varies from 850 nm to 3.5 m of length.
Detailed explanation-5: -Optical storage is any storage type in which data is written and read with a laser. Typically, data is written to optical media such as compact discs (CDs) and digital versatile discs (DVDs).